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Date: Sat Jul 30 03:12:50 2005 From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu) Subject: Cisco IOS Shellcode Presentation On Fri, 29 Jul 2005 15:02:51 -1000, Jason Coombs said: > There are any number of technical solutions that one could use to > redesign, fundamentally, the turing machine so that before each > operation is performed a verification step is employed to ensure that > the operation is the correct one in the correct sequence given prior > configuration settings loaded into memory at the time the device was > activated. Ahem. No. You *can't* "ensure" it (although you *can* do things like bounds checking to *minimize* issues). It's called the Turing Halting Problem, and in fact, the 'Turing machine' was invented specifically to (a) show the problem for that simple architecture, and then (b) show that all Turing-equivalent systems have the exact same problem. -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 226 bytes Desc: not available Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20050729/51e67287/attachment.bin
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